Leiden Weather in September

September in Leiden typically sees daytime highs of 20°C (68°F) and nighttime lows of 13°C (55°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the summer season.

Rainfall in Leiden in September

Past climate data indicates that roughly 16 days will see rain, totalling around 92 mm (3.6 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Leiden in September

Leiden in September is worth a visit. The temperature is excellent, with 20°C (68°F) during the day and 13°C (55°F) at night. September is part of summer. Conditions are often most pleasant around the middle of the day. At 13°C (55°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Leiden in September

The month experiences a moderate amount of sunlight, with 144 hours of sunshine. This provides a nice balance between sunshine and clouds.

Wind Speed in Leiden in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

If your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Leiden.

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For a detailed overview over the year and the best time to visit the Netherlands, check out our Leiden's climate page.

Leiden Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 20°C (68°F)  

Chance of Rain 52%  

Precipitation 92 mm (3.6 in)  

Rainy days 16 days  

Humidity 82% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 144 hours *  

Percentage Sunshine 37% *  

* Data from: Valkenburg, the Netherlands (5 KM, 3 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Leiden typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 13°C (55°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Leiden in September

Browse day-by-day weather records for Leiden spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Leiden historical weather extremes in September

Our historical data for Leiden spans 1976 to 2025, revealing these weather extremes.

• The warmest day in September was on September 13, 2016, with a maximum of 31°C (88°F).
• The coldest September day was on September 22, 1996, with a maximum of 11°C (52°F).
• The lowest overnight temperature recorded in September was 2°C (36°F) (September 29, 1979).

What to Wear in Leiden in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Leiden in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the Netherlands, check out our Leiden's climate page.

More climate data for Leiden

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Leiden climate overview or explore weather in the Netherlands.